An autopsy conducted by the Cook County medical examiner's office determined that the primary cause of death for the victim, Frankie Baity, was heart disease but the autopsy also determined that a secondary cause of death was multiple injuries he sustained in the assault, according to the office. Officials ruled the man's death a homicide.

Baity, 76, of the 4100 block of South Indiana Avenue was pronounced dead at 5:40 p.m. Monday at Sacred Heart Hospital, officials said.

Baity was hospitalized at Mercy Hospital and Medical Center after he was jumped from behind in the 4200 block of South Indiana Avenue on March 6 and the suspect bit his right pinkie finger to remove the $10 he was holding, police said.

On Monday, he began complaining of pain and a relative took him to Sacred Heart, where authorities found he had suffered four broken ribs, police said.